
    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>如何在Spring Boot中配置分布式配置中心 - 交互式测验</title>
      <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');
        
        body {
          font-family: 'Noto Sans SC', sans-serif;
          background-color: #f4f7f9;
          color: #333;
          display: flex;
          justify-content: center;
          align-items: center;
          min-height: 100vh;
          margin: 0;
          padding: 20px;
          box-sizing: border-box;
        }
        
        .main-wrapper {
            position: relative;
            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .quiz-container {
          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
          width: 100%;
          max-width: 700px;
          overflow: hidden;
          z-index: 10;
        }

        .quiz-header {
          background-color: #4a90e2;
          color: white;
          padding: 20px 30px;
          text-align: center;
        }

        .quiz-header h1 {
          margin: 0;
          font-size: 24px;
          font-weight: 700;
        }
        
        .quiz-header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
        }

        #progress-indicator {
            height: 100%;
            width: 0%;
            background-color: #4caf50;
            border-radius: 5px;
            transition: width 0.3s ease;
        }

        #question-container {
          margin-bottom: 20px;
        }

        #question-text {
          font-size: 18px;
          font-weight: 500;
          line-height: 1.6;
          margin-bottom: 25px;
        }

        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
          background-color: #f8f9fa;
          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        
        #next-btn {
            background-color: #28a745;
        }

        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
        }
        
        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
        }

        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
        }

        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
        }
        
        .result-box h3 {
            margin-top: 0;
        }

        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
        }
        
        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        .score-card p {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
            color: #333;
        }
        .score-details table {
            width: 100%;
            font-size: 16px;
        }
        .score-details td {
            padding: 4px 0;
        }
        .score-details td:last-child {
            text-align: right;
            font-weight: 700;
        }
        .report-actions button {
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 8px;
            padding: 12px 25px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 10px;
            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
        }
        .report-actions button:hover {
            background-color: #f1f1f1;
            border-color: #bbb;
            transform: translateY(-2px);
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        .report-actions button.primary {
            background-color: #28a745;
            color: white;
            border-color: #28a745;
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        .report-actions button.primary:hover {
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        .hint-container {
            background-color: #e0f7fa;
            border: 1px solid #b2ebf2;
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>如何在Spring Boot中配置分布式配置中心 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "在微服务架构中，引入分布式配置中心（如 Spring Cloud Config）最主要的目标是解决什么问题？",
    "options": [
      "提高单个微服务的运行性能和响应速度。",
      "集中管理所有服务的配置，解决配置分散、管理困难和不一致的问题。",
      "为服务间的通信提供加密通道，增强安全性。",
      "自动化微服务的部署和回滚流程。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "分布式配置中心的核心价值在于将所有微服务的配置从各自的应用程序中分离出来，进行集中存储和管理。这极大地简化了配置的维护工作，降低了因配置不一致而导致错误的风险，特别是在服务数量众多的微服务环境中。",
    "source": "文档中「分布式配置中心的概念」及「1. 集中管理」部分",
    "hint": "思考一下当你有几十个甚至上百个微服务时，如果每个服务的配置都散落在自己的代码库里，会带来怎样的管理噩梦。"
  },
  {
    "question": "要启用一个 Spring Boot 应用作为 Spring Cloud Config 的配置服务端(Config Server)，必须在主启动类上添加哪个注解？",
    "options": [
      "@EnableConfigClient",
      "@EnableDiscoveryClient",
      "@EnableConfigServer",
      "@EnableAutoConfiguration"
    ],
    "correctAnswerIndex": 2,
    "explanation": "注解 `@EnableConfigServer` 是激活 Spring Cloud Config Server 功能的关键。一旦在 Spring Boot 应用的主类上添加了这个注解，该应用就会被识别为一个配置中心服务端，具备向客户端提供配置信息的能力。",
    "source": "文档中「配置 Config Server」->「3. 添加 Config Server 注解」部分",
    "hint": "服务端（Server）和客户端（Client）通常有相对应的注解来启用它们各自的功能。"
  },
  {
    "question": "一个微服务（Config Client）需要从 Config Server 获取配置。在其 `application.yml` 文件中，哪两个属性是建立连接和身份识别最核心的配置？",
    "options": [
      "server.port 和 spring.profiles.active",
      "spring.application.name 和 spring.cloud.config.uri",
      "spring.cloud.config.uri 和 management.endpoints.web.exposure.include",
      "spring.cloud.config.server.git.uri 和 spring.application.name"
    ],
    "correctAnswerIndex": 1,
    "explanation": "`spring.cloud.config.uri` 用于告诉客户端Config Server的地址，以便它知道去哪里拉取配置。`spring.application.name` 则用于标识客户端自身的服务名，Config Server会根据这个名字查找对应的配置文件（例如 `my-service.yml`）。",
    "source": "文档中「配置 Config Client」->「3. 配置 application.yml 或 application.properties」部分",
    "hint": "客户端需要知道两件事：'配置中心在哪里？' 和 '我是谁？'。"
  },
  {
    "question": "为了实现配置的热更新（不重启服务使新配置生效），除了引入 Actuator 依赖和暴露 refresh 端点外，还需要在使用了配置项的Bean上添加哪个关键注解？",
    "options": [
      "@Configuration",
      "@RefreshScope",
      "@Component",
      "@Value"
    ],
    "correctAnswerIndex": 1,
    "explanation": "`@RefreshScope` 注解用于标记一个Bean，使其具备“可刷新”的能力。当 `/actuator/refresh` 端点被触发时，所有被 `@RefreshScope` 标记的Bean都会被销毁并重新创建，从而获取到最新的配置属性值。没有这个注解，即使触发了刷新，Bean内部的属性值也不会更新。",
    "source": "文档中「配置热更新」->「3. 实现原理」和「4.3. 使用 @RefreshScope」部分",
    "hint": "这个注解为Bean提供了一个特殊的“作用域(Scope)”，使其生命周期可以被外部事件（如配置刷新）所控制。"
  },
  {
    "question": "在配置好热更新后，当Git仓库中的配置发生变更时，需要通过什么操作来主动通知客户端应用刷新配置？",
    "options": [
      "向客户端应用的 `/actuator/restart` 端点发送一个POST请求。",
      "客户端应用会自动检测到Git变更并刷新，无需任何操作。",
      "向客户端应用的 `/actuator/refresh` 端点发送一个POST请求。",
      "向Config Server的 `/actuator/refresh` 端点发送一个POST请求。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "配置更新后，需要向具体的客户端微服务实例发送一个HTTP POST请求到其暴露的 `/actuator/refresh` 端点。这个请求会触发该客户端实例重新从Config Server拉取最新的配置，并刷新其内部被 `@RefreshScope` 标记的Bean。",
    "source": "文档中「配置热更新」->「4.4. 触发配置刷新」部分",
    "hint": "思考一下，是哪个组件需要被“刷新”？是配置中心，还是使用配置的那个具体服务？"
  },
  {
    "question": "Spring Cloud Config 的一个重要特性是能够与版本控制系统（如Git）集成，这主要带来了什么好处？",
    "options": [
      "只能使用Git作为唯一的配置存储后端。",
      "可以对配置的每一次修改进行追踪、审计和回滚，提高了配置管理的安全性和可靠性。",
      "显著提升了从配置中心读取配置的性能。",
      "自动将配置文件编译成二进制格式以加快加载速度。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "通过将配置存储在Git等版本控制系统中，每一次配置的变更都会有提交记录。这使得配置管理变得像代码管理一样，可以清晰地追踪谁、在何时、修改了什么内容。当出现问题时，可以方便地查看历史记录或将配置回滚到之前的某个稳定版本。",
    "source": "文档中「Spring Cloud Config 概述」->「3. 版本控制」部分",
    "hint": "想象一下管理代码时，版本控制系统（如Git）提供了哪些核心能力。这些能力同样适用于管理配置文件。"
  },
  {
    "question": "根据文档，Spring Cloud Config Client如何根据不同的环境（如dev, prod）加载对应的配置？",
    "options": [
      "通过在 `application.yml` 中设置 `server.port` 来区分。",
      "通过为每个环境启动一个独立的Config Server实例。",
      "通过在客户端的 `application.yml` 中设置 `spring.profiles.active` 属性，客户端会请求带有对应profile后缀的配置文件。",
      "Config Server会根据客户端的IP地址自动判断其所属环境。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "Spring Cloud Config通过Profile机制实现环境隔离。客户端可以通过设置`spring.profiles.active=dev`来激活`dev`环境。此时，它会向Config Server请求名为`{application-name}-dev.yml`的配置文件，以及通用的`application-dev.yml`。这使得为不同环境提供专属配置变得非常简单和清晰。",
    "source": "文档中「配置 Config Client」->「5. 激活 Profiles」部分",
    "hint": "Spring Boot本身就有一种强大的机制来管理不同环境的配置，Spring Cloud Config沿用了这一思想。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  